That looks interesting. Someone said he installed it in a 2020 JT and it would only use 1 bolt on each side. I will try to get some measurements, I have a 2018 JLU and a 2021 JT.
This is your answer, It is not seeing it because you are not on the correct port for it to see it. I have been doing PCs for a long time. USB is plug and pray that it reads it correctly.
That looks pretty good! Printing them at 45 degree angle will definitely make them stronger. Do they have PETG? It has more flex than PLA. I am guessing you are putting them into a Rubigrid?